His investigation can help restore public confidence in the FBI and intelligence services.

Attorney General William Barr has assigned U.S. Attorney John Durham to investigate possible abuses by law enforcement and intelligence officials in the 2016 election campaign, and the reaction has been predictably partisan. Trumpians are demanding heads on pikes while liberals are calling it a hunt for conspiracies that didn’t exist. We see it as a necessary step toward accountability and restoring public confidence in America’s enforcement agencies.

Mr. Durham comes with more experience than even special counsel Robert...